stdio-common/Xprintf_buffer_pad_1.c

   1 /* Write repeated characters to struct __*printf_buffer.  Generic version.
   2    Copyright (C) 2022-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <string.h>
  21
  22 void
  23 Xprintf (buffer_pad_1) (struct Xprintf_buffer *buf, CHAR_T ch, size_t count)
  24 {
  25   if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
  26     return;
  27
  28   do
  29     {
  30       /* Proactively make room.  __*printf_buffer_pad has already
  31          checked for a zero-length write, so this function is only
  32          called when there is actually data to write.  */
  33       if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
  34         return;
  35       assert (buf->write_ptr != buf->write_end);
  36       size_t to_fill = buf->write_end - buf->write_ptr;
  37       if (to_fill > count)
  38         to_fill = count;
  39       MEMSET (buf->write_ptr, ch, to_fill);
  40       buf->write_ptr += to_fill;
  41       count -= to_fill;
  42     }
  43   while (count > 0);
  44 }